I understand. Like you, I think it would be unbelievably arousing to see your white wife/gf really enjoying sex with her black lover - I don't think actually seeing the pleasure in her eyes and face could be bettered. However, it's amazing what the mind can conjure up. And seeing her dress sexy and head out to meet her black lover, leaving the cuck at home, would have my mind working overtime.
Then the wait for her return and an intimate description of what she and her black lover/s have been up to - amaaaazzzzzing!!